demarcate

verb (used with object), de·mar·cat·ed, de·mar·cat·ing.

1. to determine or mark off the boundaries or limits of: to demarcate a piece of property.
2. to separate distinctly: to demarcate the lots with fences.

verb (tr)

1. to mark, fix, or draw the boundaries, limits, etc, of
2. to separate or distinguish between (areas with unclear boundaries)

v.

1816, back-formation from demarcation. Related: Demarcated; demarcating.